Hot Topics: The DuraSpace Community Webinar Series
Series Two: All About Audio and Video Content in Repositories
5-16-12 Webinar, Preserving Audio & Video Digital Media
Tech-Forward - Achieving Business Readiness For Copilot in Microsoft 365
5 16-12 curated series #2 presentation
1. Hot Topics: The DuraSpace
Community Webinar Series
Series Two:
Managing and preserving audio and
video in your digital repository
Curated by Karen Cariani
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
2. Using the Webinar
Platform
• 2-way audio for all
participants is muted
• We’ll utilize the Chat
Window for the Q&A portion
or you may use it if you are
having technical difficulties
• You may type your question
here & hit ‘enter’
3. Webinar 1: The Big Picture:
Preserving Audio & Digital Media
Presented by:
Karen Cariani,
Karen Colbron & Dave MacCarn
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
4. About our presenters
• Karen Cariani, Director, Media Library
& Archives, WGBH Boston
• Karen Colbron, Digital Archives
Manager, WGBH Boston
• Dave MacCarn, Chief Technologist,
WGBH Boston
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
29. From Analog to Digital to HD
• The Machine was the format.
• Now the format is file containing a
codec and a wrapper.
• Explosion of new formats with the
start of standard-definition digital
video and an even broader array of
options for high–definition recording.
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
31. Lots of Data to Collect
• The Math:
– 1920 horizontal pixels x 1080 vertical
lines x 30fps x 3 samples/pixel x 8-
10 bits/sample =
>1.2 billion bits per second.
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 31
32. Techniques for Data Reduction:
• Resolution Sub-sampling
• Video Encoding/Sampling
• Video Compression
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 32
33. Chroma & Luma Sample
No Chroma Sample
4:4:4
4:2:2
4:2:0
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 33
34. Video Compression
• DCT (discrete cosine transform)
• Wavelet transform
• MPEG
• H.264 (AVC)
• MPEG4 Studio Profile
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 34
37. May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 37
38. Containers
• AVI
• DV-DIF
• QuickTime
• FLV
• MP4
• Motion JPEG2000
• MXF
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 38
39. The Scrambling Problem
• Howard Besser – Digital Longevity
– http://besser.tsoa.nyu.edu/howard/P
apers/sfs-longevity.html
• Adds to the complexity of the archive.
• MXF uses KLV
– The requirement of a library of Keys.
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
40. Practice
• Store as few different wrappers as
possible.
– Rewrap if you can.
• Know your codecs.
• If you need to transcode make the
product of equal or higher quality.
• Watch out for encoding changes.
• Know your licensing.
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
41. Questions?
Karen Colbron
WGBH Boston
Karen_colbron@wgbh.org
Dave MacCarn
WGBH Boston
Dave_maccarn@wgbh.org
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
42. Solutions for
Digital Media Preservation
• DuraCloud is simple, flexible and cost
effective
• DuraCloud offers expandable storage
space as needed for your media files
• Streaming media services available
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
43. Solutions for
Digital Media Preservation
• Sign up for a free 2 month trial account
today www.duracloud.org
• Priced for every budget
http://duracloud.org/pricing
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series